Tex. Ins. Code § 1252.204
(a) A succeeding carrier's health benefit plan that limits coverage in accordance with a preexisting conditions provision, other than a waiting period, must provide, during the period the limitation on coverage is in effect, the level of benefits prescribed by this section to an individual covered by the succeeding carrier who:
(b) The health benefit plan must provide a level of benefits equal to the lesser of:
Added by Acts 2003, 78th Leg., ch. 1274, Sec. 3, eff. April 1, 2005.